Updated 4 June 2013Bike: AVL, 500 Electra.
Carb: BS-29 (CV carb by Ucal, Mikuni design & jets).
Filter: K&N DU-0100, in stock electra airbox, box drilled, and internal walls removed per this thread:
http://www.enfieldmotorcycles.com/forum/index.php/topic,117.0.html.
Exhaust: Unrestricted short bottle; No cat. in pipe; No baffle
PAV: Removed and plugged at head.
Altitude: sea level, plus a couple hundred feet.
Pilot jet: 17.5 (Stock is 15) - VM22/210 (from Jets R US)
Main Jet: 117.5
115 (Stock is 110) - N102.221 (small - understand you can also use N100.604)
Needle Jet: 4DHL38. Plastic washer, 2.45 mm thick, 8.2 mm OD, tight fit but moves, middle clip setting.
Piston Valve (CV slide): Bored out the 2x vacuum openings by +1/16 inch. Crisper response... doesn't appear to affect fuel/air ratios. Does affect fuel consumption.
Performance notes: The carb pulls very nicely throughout the power band. Have to say, I'm impressed with its 'zippy ness'. Have a bit of hesitation between 1/8 and 1/4 throttle. Going to shim needle richer. If that doesnt work, will remove .7 to .8 mm of slide piston (making it richer).
Update: After plug checks, moved to a richer main jet. I have both a 117.5 and a 120. Using the 117.5 now as its warmer (60's to 70's); Will use the 120 in the fall. Starting: Both hot and cold were difficult to kick start. Learned to grab about 1/8 throttle on kicking, and now i get 1 kick starts. I thinking the AVL likes more air at start or it could be a result of the enlarged holes in the piston, i dunno. Generally, one is instructed not to touch the throttle on a CV carb; not true for my bike. Also, the 17.5 pilot is almost
too rich. The mixture control screw is very sensitive and is currently working best between 1/2 and 1/4 turn out. The bike didn't like 15 pilot; even at 6 turns out(!) it was
starved & lean when rolling onto the throttle